Finder is committed to editorial independence. While we receive compensation when you click links to partners, they do not influence our content.

Understanding baby clothes sizes

From onesies to overalls, find a safe, snug fit for that bundle of joy.

Whether you’re a first-time parent to a little one or buying a gift for another person’s new arrival, it can be tricky to navigate the world of baby clothes sizes. It turns out that fit depends on a baby’s age and size.

Baby clothes sizing guide

Preemie

The smallest on the market, preemie clothing is designed to fit babies who arrived early or are simply small. Generally, these clothes are designed babies who weigh under 6 pounds and measure under 17 inches long.

Newborn

If you’re buying clothes for the average newcomer, newborn size is a safe bet — unless you’ve heard they’re smaller or bigger than average. Newborn fits babies of 6 to 9 pounds and around 21.5 inches.

0 to 3 months

This size is a good choice for babies who aren’t yet 3 months old. But most newborns can grow into this size, if you just can’t help yourself. It generally fits babies that weight 9 to 12.5 pounds and measure 21.5 to 24 inches long.

3 to 6 months

At this size range, you’re in for shopping fun with broader options of tops, bottoms and outfits. This size fits little ones who weigh up to 17 pounds and measure 24 to 26.5 inches long.

6 to 9 months

You’ll find lots of options in this size across retailers, making it a baby shower gift to grow into. It’s intended for babies weighing up to 21 pounds and measuring up to 28.5 inches.

9 to 12 months

Hello first birthday! Gift this size or plan ahead for your new 1-year-old weighing up to 25 pounds and measuring up to 30.5 inches.

18 months

If you’re looking at this size, your baby may be well into toddlerhood. It fits a kid between an average 25 to 28 pounds and measuring up to 32.5 inches.

24 months

The largest “baby” size fits active kiddos who weigh between 28 and 30 pounds and measure from 32.5 to 34 inches. It coincides with measurements for 2T toddler clothing.

5 tips for buying clothes for baby

You’ve worked out the sizing, now clothe your cutie in adorable and useful duds with smart guidance in mind.

1. Go big

When in doubt, opt for a larger size that gives baby room to grow into. And Mom or Dad options for sudden growth spurts.

2. Keep weather in mind

With how quickly kids grow, there’s little use buying a sundress in winter when it likely won’t fit by the time summer rolls back around.

3. Resist gendered gear

You’re under no obligation to stick to “boy” or “girl” colors or styles. Embrace all the cheery colors of the rainbow.

4. Keep it simple

Fluffy ears and a bunny tail is ridiculously adorable, sure. But hoods and attachments can be a hazard to newborns and keep them from the deep sleep they need.

5. Think practical.

The only thing more difficult than changing a squirming baby is clothing that’s a challenge to remove. Any new parent appreciates useful, easy-off outfits.

Editor's Pick

PatPat

PatPat

Adorable outfits and onesies for babies, from 0 to 24 months and beyond.

No crying here! PatPat pairs consistently low prices with dependable quality and a 30-day return policy, which means you can stock up on all the baby clothes your doting heart desires — without making your wallet wail. For instance, pick up a lovely cotton/linen blend two-piece set for just $10.

  • Free shipping over
  • No free returns
  • No financing options

Shop now

Top baby clothing deals and coupons

RaddishRaddish
Exclusive

Save $15 on a 6 month membership at checkout!

Last verified

Exclusive
RaddishRaddish
Exclusive

Save $20 on a 12 month membership at checkout!

Last verified

Exclusive
AmazonAmazon

Create your baby registry with Amazon today

Last verified

AmazonAmazon

Up to 20% off baby diapers, food, and more with Amazon family

Last verified

Children's PlaceChildren's Place

Sign up to the newsletter and get $10 off your next purchase

Last verified

Deal ends

AliExpressAliExpress

Up to 60% off Baby and Kids items

Last verified

Deal ends

LacosteLacoste

Shop all the essentials for your baby to teenager and free shipping on orders $49+

Last verified

Deal ends

PumaPuma

Shop kids best sellers and get free shipping on orders $50+

Last verified

Deal ends

Olympia SportsOlympia Sports

Frosty winter kids boots now: $19 and free shipping

Last verified

Deal ends

Olympia SportsOlympia Sports

Nike big kids air zoom arcadia shoes was: $75.00 now: $43.00 and free shipping

Last verified

Deal ends

PatPatPatPat

Summer Clearance Sale: up to 70% off baby clothes

Last verified

Olympia SportsOlympia Sports

Nike kids alpha menace shark 2 football cleats was: $40.00 now: $28.99

Last verified

Deal ends

Olympia SportsOlympia Sports

Nike Kids Renew Run now: $37.50

Last verified

Deal ends

Olympia SportsOlympia Sports

Nike Kids Free RN 2018 Pre-School Shoes was: $80 now: $38

Last verified

Deal ends

Olympia SportsOlympia Sports

Nike Kids Free RN 2018 Pre-School shoes was: $80.00 now: $40.00

Last verified

Deal ends

Frequently asked questions

More guides on Finder

Ask an Expert

You are about to post a question on finder.com:

  • Do not enter personal information (eg. surname, phone number, bank details) as your question will be made public
  • finder.com is a financial comparison and information service, not a bank or product provider
  • We cannot provide you with personal advice or recommendations
  • Your answer might already be waiting – check previous questions below to see if yours has already been asked

Finder.com provides guides and information on a range of products and services. Because our content is not financial advice, we suggest talking with a professional before you make any decision.

By submitting your comment or question, you agree to our Privacy and Cookies Policy and finder.com Terms of Use.

Questions and responses on finder.com are not provided, paid for or otherwise endorsed by any bank or brand. These banks and brands are not responsible for ensuring that comments are answered or accurate.
Go to site